dzipf <- function(x, N, s, log = FALSE) {
N[ !is.finite(N) | N <= 0 | !is.wholenumber(N) ] <- NaN
s[ !is.finite(s) | s <= 0] <- NaN
y <- -s*log(x)-log(sum(1/(1:N)^s))
if (any(is.nan(y))) warning ("NaNs produced")
if (any(!is.wholenumber(x))) warning("non integer values in x")
y[ ! is.wholenumber(x) | x < 1 | x > N] <- -Inf
if(log) return(y)
else return(exp(y))
}
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